Search the forum,

Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure

Post new thread

Discuss Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure in the USA area at PlumbersForums.net

B

Blackrock63

Messages
3
I have a Grundfos MQ series domestic pump and it has started cycling on and off. The pressure at the outlet reaches approx 2 bar of pressure and the pump shuts off. The pressure then immediately drops as it overflows out of the Pressure Relief valve. Once the pressure gets to 1.5 bar the pump kicks in and the cycle of off/on starts again and again.

I have today replaced the pressure relief valve and the pump was fine for about an hour and now it has started to go through the same process of dumping water out the pressure relief valve and cycling through the on/off process of getting up to 2 bar and then losing pressure.

Attached is a short video of it happening and a picture of the pump and PRV.

Does anyone have any ideas as to what the issue may be?

Thanks in advance of any help and support you can provide

Blackrock63
 

Attachments

  • IMG_1446.JPG
    IMG_1446.JPG
    94 KB · Views: 10
  • IMG_1448.mp4
    3.1 MB
UPDATE: I have managed to sort this issue. It turned out to be a faulty expansion vessel which Dumb& Dumber plumbers had fitted incorrectly. The PRV did keep releasing water for a few days after i replaced the EV but it now seems to hve settled down and everything seems good again
 

Reply to Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure in the USA area at PlumbersForums.net

Similar plumbing topics

C
Mixer bar fitting solutions?
The fittings below are for a mixer bar attached to a self contained shower. i.e not a wall. The attaching screws have snapped. I could get two new brackets, dismantle that existing one and start again or I could try and re attach via those screws, removing the broken ones from the plate and wall...
Replies
1
Views
189
SimonG
SimonG
F
Mystery Mira Elite QT Leak
Hi All I have a leak coming from within my Mira Elite QT shower. It seems to be flowing from behind the switching Control. Any ideas what could be causing this leak. Already Changed the Pump Elbow as one of the clips had popped which was causing a second small leak, Any idea? Is it time to buy...
Replies
0
Views
228
Firefox
F
C
How to identify dripping tap.
Our kitchen mixer tap has started dripping. Like so much of the plumbing in our almost new build bungalow, it is lacking! The plumber didn't install any isolating cocks in the H&C feed to the tap so how can I identify which of the valves is passing? Shut the whole H&C water system down?
Replies
12
Views
316
Timmy D
T
D
Covering shallow sewer pipe under concrete Patio
Hello all, I’m replacing a concrete paving slab patio in the back yard. The original patio used 50mm deep concrete slabs on hardcore & sand. I’m planning to pour a 100mm deep concrete patio on 100mm hardcore. In order to achieve the same final height to line up with the rest of the patio, I...
Replies
6
Views
224
DIwhYdidIstartThis
D
P
Repeated Airlock in Bathroom
Hi, Can anyone advise as to why the cold water to my bathroom keeps airlocking? This originally happened about 12 months ago and has happened 3-4 times since. It’s an upstairs bathroom, fed from a tank in the attic. The tank is about 8 Meters away and feeds a bath, sink and toilet. The tank...
Replies
9
Views
316
Chuck
C
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock